4" Air Stone Sander/Polisher PLW923S Flex is proud to introduce a revolutionary new Air Sander/Polisher that set a new standard in stone working excellence in granite, marble and concrete. Designed especially for use by shop workers, fabricators and for production use, this high performance polishing tool is ergonomically designed for ease of use. The compact, lightweight design gets into tight places with ease, and allows for all-day use with less operator fatigue. The PLW923S Air Stone Sander/Polisher features a central water feed with rear exhaust, and accepts 3", 4", or 5" discs. It comes with a Velcro pad, bail handle, side handle, wrenches, hoses for air, water and exhaust along with appropriate fittings.